Sound-producing apparatus or electromagnetic receiving or emitting device



May 19, 1925. 1,538,319

L. GAUMONT SOUND PRODUCING APPARATUS, OR ELECTROMAGNETIC RECEIVING 0R EMITTING DEVICE Filed June 12, 1925 Patented May 19, 1925.

UNITED s'rArEs PATENT orrlca,

' Lnon oenmon'r, or rams, FRANCE, ASSIGNOR rr'o sooIETn nns manmssnxnnrs I oaomon'r, or rams. FRANCE.

SOUND-PRODUCING A7PARATUS R ELECTROMAGNETIC RECEIVING OB EMITTING DEVICE.

' Application filed June 12, 1923. Serial No. 644,985.

To all whom it may concern:

Be it known that 1, Lion GAUMoNr, a citizen of France, and a resident of Paris, France, have invented new and 'usei'ul Im- 6 pwvenients in Sound-Producing Apparatus llllectromagnetic Receiving or Emitting evices, which'is fully set forth in the following specification.

In the U. S. Patent No. 1,523,262, dated 1'? Jan. 13, 1925, there is described an apparatus for the production of sounds, constituted by a magnet having an air gap,a wire winding on a support, said wire having thereine ,variabie current produced. by the acoustlc die laeements or: being capable of'produeing sue displacements, said winding representing at the same time a mechanical element receiving or emitting vibrations and an electromagnetic element producing or receivmg the variable current. The present invention relates to various improvements in'thc construction of the said wire winding, and it provides for the maximum acoustic efficiency as well as a correct tone. v

The movements of the said wire winding under the action of the telephone current,

which moon the order of 0.01 millimeter,

' are also to be produc d without any appre:

,eiable damping, but nevertheless the wire winding must not assume any proper vibration under the action of forces having great amplitudes whereby a veritable phenomenon of resonance would take place.

According to the present invention, the

85 said wire winding is mounted upon wedgeshape'd bridges and is subjected to a well--' determined tension.

The following description, together with the appended drawings which are given by 40 way of example, sets forth the improvements according to the present invention.

Fig. l is a cross-section oi a wedge-shaped piece or bridge.

Fig. 2 shows the bridges disposed upon the cone.

Fig. 3 is an axial section of the cone and the wire winding.

Fig. 4 is a diagrammatic view showing the conneetirms between the line wires and the diaphragm conductors.

The wire winding is mounted upon the wedge-shaped bridges a which are consti-' tuted by rings of anelastic substance of triangular cross-section and having a rather sistunce in the case of very small vibrations,

but the resistance will on the contrary increase at a rapid rate with the amplitude of the vibrations.

The said bridges may have different heights from the top to the base of the cone;

the spacing will vary with the total surface of the diaphragm.

The said wire winding is mounted at its lower edge upon a metal ring 0 screwed upon the magnetic pole which isapertured at the base of the cone 6; the ring will thus provide for an adjustment of the wire winding upon the elastic bridges whiph is perforine in an exact and sensitive manner.

' The said ring 0 may be readily secured in position aft-er making the adjustment, by the use of a metallic stop-piece d which is pressed upon it by the screw 6 or by like means,

Fig. 3.

The connection of the wire constituting the wire winding (1 with the wiresoi the circuit proceeding to the terminals is the weak point in the vibratin wire winding device; wires of very small diameter in aluminium or magnesium have but little mechanical strength and are easily broken under the action of vibrations of great amplitude made by a wire'winding which receives an amplified current.-

This drawback can be obviated by making the electric connectionswith the wire winding in the following manner.

The first three or four spiral turns of wire m are stripped of insulation and are connected together at'three or more points by the binding elements g 9 g of copper conductor 7L1 If 11 with he telephone circuit, Fig. 4. This arrangement forms a heavy turn in short-circuit which is not subject to vibrations.

Obviously, the said device is susceptible of modifications in :detail without departing from the principle oi' the invention.

.wire, each pointbeing connected by a flexible as Li What Iclaim is:

1. In an apparatus "for the emission and rece tion of sound constituted by a magnet iaving an air gap, a wire winding on a support, said wire having therein a variable current produced by'the acoustic displacements or being capable of producing such displacements, said winding representing at the same time a mechanical element receiving or emitting vibrations and an electromagnetic element producing or receiving the variable current, rings of elastic material disposed upon the lower pole-piece of the magnet for supporting the wire winding.

2. In an apparatus for the emission and reception of sound constituted by a magnet having an air gap, a wire winding on a sup port, said wire havin therein a variable current produced by t is acoustic displace ments or being capable of producing such displacements, said winding representing at the same time a mechanicai element receiving or emitting vibrations and an electromagnetic element producing or receiving the variable current, rings of elastic material and of triangular cross-section with an acute angle at the ajex, disposed upon the lower pole-piece of the magnet for supporting the wire winding.

3. In an apparatus for the emission and reception of sound constituted by a magnet having an air gap, a Wire winding on a support, said wire havin therein a variab current produced by the acoustic displacements or being capable of producing such displacements, said winding representing at the same time a mechanical element receiv ing or emitting vibrations an electromagnetic element producing or receiving the variable current and rin s dis osed in concentric position and wit uni 'orm spacing upon the lower pole-piece of the magnet for supporting the wire winding.

4. In an apparatus for the emission and reception of sound constituted by a magnet having an air gap, a wire windir. on a sup port, said wire haviu therein a variable current produced by t e acoustic displace ments or being capable of producing such displacements, said windin representing at the same time a mechanica element receiving or emitting vibrations and an electromagnetic element producing or receiving the variable currcnt and'means provided upon the lower pole-piece of the magnet'for sup porting the wire winding.

5. In an apparatus for the emission and reception of sound constituted by a magnet having an air gap, a wire winding on a support, said wire iavin therein a variable current produced by t e acoustic displace menis or being capable of producing such displacements, said winding representing at the same time a mechanical element rcceiving or emitting vibrations and an electromagnetic element producing or receiving the variable current, rings disposed upon the lower pole-piece of the magnet for supporting the wire winding, and means for stretchinch the wire winding upon the said rings.

(3. In an apparatus for the emission and reception of sound constituted by a magnet having an air gap, a wire winding on a support, said wirc haviir therein a variable current produced by the acoustic displacements or being capable of producing such displacements, said winding representing at the same time a mechanical element receiving or emitting vibrations and an clectromagnetic element producing or receiving the variable current, rings disposedupon the lower pole-piece of the magnet for support ing the wire windine, an internally screwthreaded ring secured to said wire winding, a corresponding screwthrcad formed upon a cylindrical portion of the polepiece below the tapered portion.

7. In an apparatus for the emission and reception of sound constituted by a magnet having an air gap, a wire winding on a sunport, said wire havin therein a variable current produced by t e acoustic displ cements or being capable of producing such displacements, said Winding representing at the same time a mechanical element receiving or emitting vibrations and an electroma etic element producing or receiving the variable current, rings disposed upon the lower pole-piece of the magnet for supporting the wire winding, an internally screwthreaded ring secured to said diaphragm, a corresponding screwthread formed u on a cylindrical portion of the pole-piece claw the tapered portion, means for securing the said ring in position.

8. In an apparatus for the emission and reception of sound constituted by a magnet having an air gap, :1 wire winding on a support, said wire having therein a variable current produced by the acoustic displacements or being capable of producing such displacements, said Winding representing at the same time a mechanical element receiving or emitting vibrations and an olectro-- magnetic element producing or receiving the variable current, supporting means pro vided upon the lower pole-piece for sup orting the Wire winding, means for stretc ing the wire winding upon the said supporting means, means for supplying electric. current to the Wire of the diaphragm.

9. In an apparatus for the emission and reception of sound constituted by a magnet having an air gap, a wire winding on a su port, said wire having therein a variabe current produced by the acoustic displace ments or being capable of producing such displacements, said winding representing at the same time a mechanical clement receiving or emitting vibrations and an electromagnetic "prhdu'cin g or reeei'vi the;

variable current, the first turns of con ucting wire of the wire winding arebared and short circuited, and the wires of the supply circuit are connected to the hated wires. 10. In an apparatus for the emission and t reception of sound constituted by a magnet hav ng an air gap, 9. wire winding ona support, said wire havin therein a variab current produced by t e acoustic displace- --ments or capable of producing such.

displacements; said winding representing at the same time a mechanical element receiving or emitting vibrations. and an electrothe wire winding upon the said supporting a means, the first turns of conducting wire of the wire winding are hatred and short-circuited, and the wires of the supply circuit are connected with the bared wires.

In testimony that I claim the foregoing as my invention 1 have signed my name SI hereto.

LEON GAUMONT. 

